(CNN) -- More than 450 people were evacuated by Saturday morning after a land collapse in eastern China, local authorities said, according to state media.
The collapse -- which is about 50 meters (55 yards) in diameter and up to 5 meters (16 feet) deep -- occurred Thursday evening in Jiangxi province's Huichang County, the Xinhua news agency reported.
An initial investigation indicates excessive salt mining caused the cave-in, Xinhua said.
No casualties have been reported, according to Xinhua.
Villagers reported seeing water sprouting up to 2 meters (7 feet) from the ground and cracks in the earth about 500 meters (547 yards) long since Thursday, Xinhua said.